Luminescent Layered Double Hydroxides Intercalated with an Anionic Photosensitizer via the Memory Effect

Author(s)

Teixeira, Alexandre C. ^[1] ; Morais, Alysson F. ^[1] ; Silva, Ivan G. N. ^[1] ; Breynaert, Eric ^[2] ; Mustafa, Danilo ^[1]

Affiliation

^[1] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo - Brazil

^[2] Katholieke Univ Leuven, Ctr Surface Chem & Catalysis COK KAT, B-3001 Leuven - Belgium

• Document type: Journal article
• Source: CRYSTALS; v. 9, n. 3 MAR 14 2019.
• Web of Science Citations: 1

Abstract

Layered double hydroxides (LDHs) containing Eu3+ activators were synthesized by coprecipitation of Zn2+, Al3+, and Eu3+ in alkaline NO3--rich aqueous solution. Upon calcination, these materials transform into a crystalline ZnO solid solution containing Al and Eu. For suitably low calcination temperatures, this phase can be restored to LDH by rehydration in water, a feature known as the memory effect. During rehydration of an LDH, new anionic species can be intercalated and functionalized, obtaining desired physicochemical properties. This work explores the memory effect as a route to produce luminescent LDHs intercalated with 1,3,5-benzenetricarboxylic acid (BTC), a known anionic photosensitizer for Eu3+. Time-dependent hydration of calcined LDHs in a BTC-rich aqueous solution resulted in the recovery of the lamellar phase and in the intercalation with BTC. The interaction of this photosensitizer with Eu3+ in the recovered hydroxide layers gave rise to efficient energy transfer from the BTC antennae to the Eu3+ ions, providing a useful tool to monitor the rehydration process of the calcined LDHs. (AU)

• FAPESP's process: 15/19210-0 - Nanostructured double layered hydroxides with up e down-conversion properties for applications as sensitizers in solar cells
• Grantee: Danilo Mustafa
• Support Opportunities: Research Grants - Young Investigators Grants